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A train travelling at a speed of 75 mph enters a tunnel 3½ miles long. The train is ¼ mile long. How long does it take for the train to pass through the tunnel from the moment the front enters to the moment the rear emerges?

Correct Answer: 3 min

Explanation:

Total distance covered
= 7 + 1 miles
2 4
= 15 miles.
4



∴ Time taken
= 15 hrs
4 x 75
= 1 hrs
20
= 1 x 60 min.
20
= 3 min.
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